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Evening All, Our old boiler recently gave up the ghost so bit the bullett and our local heating engineer installed a Baxi Solo 18HE condensor. The house is a 4 bed detached about 10 years old with a vented system with a mix of 15mm standarad and microbore pipes to the radiator. The boiler...

Hi all, I'm hoping a plumber or heating engineer can offer me some advice.... Basically I have an open vented CH system, which uses a Honeywell V4073A 3 port mid-position valve to control heating to water and/or the radiators. On moving into the house in Oct 2008 a new one was...